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钣金件多道次拉深中间构型的确定是塑性成形领域的一个难题。针对中间构型对多道次成形的影响,以轴对称盒形件为成形对象,采用试验方法进行了研究。试验设计了两种不同的中间构型,通过网格法研究在第1道次和第2道次中应变的分布规律;通过成形极限图研究两种中间构型第1道次和第2道次的成形性。试验结果表明,轴对称零件多道次成形在第2道次的成形中,底部成形近似为局部成形,容易在底部产生较大的拉伸应变,造成破裂缺陷,设计中间构型的底部应尽量与零件近似;第1道次和第2道次中沿母线方向的应变均为拉伸应变,自零件口部向零件底部周向的应变由压应变逐渐过渡到拉伸应变,以压应变为主,破裂一般发生在拉伸应变区。
The determination of the middle configuration of multi-pass deep drawing of sheet metal is a difficult problem in the field of plastic forming. In view of the influence of the intermediate configuration on the multi-pass forming, the axisymmetric box-shaped part is taken as the forming object, and the test method is used. Two different intermediate configurations were designed and tested. The distribution of strain in the first pass and the second pass was studied by the grid method. The first pass and the second pass of the two intermediate configurations were studied by the forming limit map. Secondary formability. The experimental results show that the multi-pass forming of the axisymmetric part in the second pass forming, the bottom forming is approximately partial forming, easy to produce a large tensile strain at the bottom, resulting in rupture defects, the bottom of the design of the intermediate configuration should be as much as possible And the parts are similar; the first and second pass along the direction of the busbar strain are tensile strain, the part from the mouth of the part to the bottom of the circumferential strain of the gradual transition from compressive strain to tensile strain to compressive strain Lord, rupture generally occurs in the tensile strain zone.